Abstract
Solid solubility of Al2O3 in orthorhombic enstatite by the substitution AlAl=MgSi is, in the range studied, mainly a function of temperature and not strongly pressure-dependent. Even at 1 kb up to 9 wt.-% Al2O3 can be substituted at 1200° C. The thermal stability of the orthorhombic pyroxene phase is strongly increased by the incorporation of Al.
In crustal rocks the alumina content of orthopyroxene might be used as a geothermometer but not, as sometimes suggested, as a barometer.
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Anastasiou, P., Seifert, F. Solid solubility of Al2O3 in enstatite at high temperatures and 1–5 kb water pressure. Contr. Mineral. and Petrol. 34, 272–287 (1972). https://doi.org/10.1007/BF00373758
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DOI: https://doi.org/10.1007/BF00373758